-- try to use our profits against us. we are watching what is happening out there. we come up with operations to increase security, adding or changing their is of security, adding layers of protection in but are do. as the threat evolves, we watch what happens and we change our operations. it is a very dynamic environment. and as much more important to understand with the ball liabilities are and mitigate those and simply to have a checklist reif follow and look for a prohibited items. this chart is a little bit difficult to see on the screen, probably, but the reason is done this way, but i will limit the discussion to just the checkpoint to give you a little preview of what is happening at every checkpoint around the country. basically, the zoll work together. there is not one silver bullet that will solve security for us. we know our adversary is watching what each of these things are. basically, when you start from the passenger perspective going through, every piece of technology is in the process of either being enh